Commonly used aluminum alloy melting furnace
refractories have common clay brick, high alumina brick and magnesite chrome brick 3 kinds.
High alumina brick is mainly used for masonry and aluminum melt contact the inner wall of the pool, and electric heating material as a support beam furnace masonry.
This kind of brick has high refractoriness, mechanical strength, good slag resistance, etc, but the price is a bit expensive, ordinary clay brick is mainly used for location and no direct contact with metallic melts furnace lining, the brick has good resistance to thermal shock resistance, small thermal conductivity, volume stability is good, price is low wait for an advantage!
What kind of commonly used aluminum alloy melting furnace lining materials are there but slag resistance is poorer, SiO2 content is higher, easy when in contact with liquid aluminum melt reduction and pollution, and easy agglomeration for aluminum melt infiltration, increases the maintenance difficulty.
So not as a general melting furnace and static furnace molten pool surface material.
Some employ foreign magnesite chrome brick as molten pool liner material, this kind of brick density is big, can prevent the aluminum melt infiltration, strong resistance to basic slag and melt erosion resistance, polluting the aluminum melt, high refractoriness, there is a better resistance to thermal shock resistance, but the price is more expensive.
In addition, the commonly used aluminum alloy melting furnace lining materials and sintered magnesia and diatomaceous soil insulating brick.
Magnesia is used primarily as a molten pool fluid line furnace wall interlayer of the following areas to lay a foundation of filling materials, prevent leakage of liquid aluminum.
Magnesia dry degree of aluminum melt had a greater influence on the air content.
Should be done before using dry processing (
650 ℃, 2 hours)
Diatomaceous earth insulating brick is mainly used for insulating lining of the furnace.
This kind of brick has small volume density, small thermal conductivity.
Heat preservation performance is good wait for an advantage, but low compression strength, high humidity can't work.
Commonly used aluminum alloy melting furnace refractory cement is brand of NF -
34 of fine clay grain of refractory mortar.
The chemical composition of the refractory cement and clay brick, and has good caking property and high strength of refractory and slag resistance.
Factors affecting hydrogen solubility in aluminum mainly have three: one temperature, two is pressure, three components.
For the specified alloy, when PH2 certain, the solubility of hydrogen in aluminum increases with temperature rise and exponential (
When T must be: the solubility of hydrogen in aluminum is proportional to the square root of the hydrogen partial pressure.
When the temperature and pressure -
Timing, for different alloy, because of the effect of alloy elements on hydrogen solution heat, allow A constant change, and therefore different solubility.
Most researchers believe that within the industrial deformation aluminium alloy because the composition of the fan, copper, silicon, manganese, zinc can reduce the solubility of hydrogen in the aluminum.
And magnesium, titanium, iron, nickel, chromium could improve the solubility of hydrogen in the aluminum.
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